When to plant sweet potato in Nagoya
Sweet potato is frost-tender, so every date keys off Nagoya's last spring frost of Mar 28.
Step 1 · Plant
Transplant outdoors
Apr 18 – May 9
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Jul 17 – Aug 16
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Nagoya's 247-day season leaves this much room.
Sweet potato on Nagoya's growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
MAR 28
NOV 30
Common questions
When will sweet potato be ready to harvest in Nagoya?
Expect to harvest from around mid July (Jul 17–Aug 16) in Nagoya, based on its local frost dates. Confidence 76%.
When can I transplant sweet potato outdoors in Nagoya?
Transplant outdoors around mid April (Apr 18–May 9) in Nagoya, based on its local frost dates. Confidence 84%.
How long is the growing season in Nagoya?
Nagoya has roughly 247 frost-free days, which is enough time to grow sweet potato to maturity outdoors.
The rule of thumb
Sow sweet potato 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. Every date on this page is derived from that rule and Nagoya's frost dates.
Confidence 84/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.